I have been trying to get a grasp of WordPress Theme Development. I have some understanding of JavaScript and PHP. When I was trying to figure out how to use the media uploader and I found several articles using lines of code like below:

mediaUploader = wp.media.frames.file_frame = wp.media({
        title: 'Choose a Profile Picture',
        button: {
            text: 'Choose Picture'
        },
        multiple: false
    });

It does not make sense to me to use "mediaUploader = wp.media.frames.file_frame = wp.media({});". Why not just use mediaUploader = wp.media({})? I appreciate any help I can get on this because I really want to understand it.

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